Rights statement: © 2011 American Physical Society
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Quasiparticle relaxation of superconducting qubits in the presence of flux
AU - Catelani, G.
AU - Koch, J.
AU - Frunzio, L.
AU - Schoelkopf, R. J.
AU - Devoret, Michel H.
AU - Glazman, Leonid
N1 - © 2011 American Physical Society
PY - 2011/2/16
Y1 - 2011/2/16
N2 - Quasiparticle tunneling across a Josephson junction sets a limit for the lifetime of a superconducting qubit state. We develop a general theory of the corresponding decay rate in a qubit controlled by a magnetic flux. The flux affects quasiparticles tunneling amplitudes, thus making the decay rate flux-dependent. The theory is applicable for an arbitrary quasiparticle distribution. It provides estimates for the rates in practically important quantum circuits and also offers a new way of measuring the phase-dependent admittance of a Josephson junction.
AB - Quasiparticle tunneling across a Josephson junction sets a limit for the lifetime of a superconducting qubit state. We develop a general theory of the corresponding decay rate in a qubit controlled by a magnetic flux. The flux affects quasiparticles tunneling amplitudes, thus making the decay rate flux-dependent. The theory is applicable for an arbitrary quasiparticle distribution. It provides estimates for the rates in practically important quantum circuits and also offers a new way of measuring the phase-dependent admittance of a Josephson junction.
UR - http://www.scopus.com/inward/record.url?scp=79951633269&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.106.077002
DO - 10.1103/PhysRevLett.106.077002
M3 - Journal article
AN - SCOPUS:79951633269
VL - 106
JO - Physical review letters
JF - Physical review letters
SN - 0031-9007
IS - 7
M1 - 077002
ER -